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From: Gavin Hu <gavin.hu@arm.com>
To: dev@dpdk.org
Cc: thomas@monjalon.net, jerinj@marvell.com, hemant.agrawal@nxp.com,
bruce.richardson@intel.com, chaozhu@linux.vnet.ibm.com,
Honnappa.Nagarahalli@arm.com, nd@arm.com, gavin.hu@arm.com
Date: Mon, 1 Jul 2019 00:21:16 +0800
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Subject: [dpdk-dev] [RFC 5/5] config: add WFE config entry for aarch64
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Add the RTE_USE_WFE configuration entry for aarch64, disabled by default.
It can be enabled selectively based on the performance benchmarking.
Signed-off-by: Gavin Hu <gavin.hu@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
Reviewed-by: Steve Capper <steve.capper@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
---
config/arm/meson.build | 1 +
config/common_armv8a_linux | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/config/arm/meson.build b/config/arm/meson.build
index 6fa06a1..939d60e 100644
--- a/config/arm/meson.build
+++ b/config/arm/meson.build
@@ -116,6 +116,7 @@ impl_dpaa = ['NXP DPAA', flags_dpaa, machine_args_generic]
impl_dpaa2 = ['NXP DPAA2', flags_dpaa2, machine_args_generic]
dpdk_conf.set('RTE_FORCE_INTRINSICS', 1)
+dpdk_conf.set('RTE_USE_WFE', 0)
if not dpdk_conf.get('RTE_ARCH_64')
dpdk_conf.set('RTE_CACHE_LINE_SIZE', 64)
diff --git a/config/common_armv8a_linux b/config/common_armv8a_linux
index 72091de..ae87a87 100644
--- a/config/common_armv8a_linux
+++ b/config/common_armv8a_linux
@@ -12,6 +12,12 @@ CONFIG_RTE_ARCH_64=y
CONFIG_RTE_FORCE_INTRINSICS=y
+# Use WFE instructions to implement the rte_wait_for_equal_xxx APIs,
+# calling these APIs put the cores enter low power state while waiting
+# for the memory address to be become equal to the expected value.
+# This is supported only by aarch64.
+CONFIG_RTE_USE_WFE=n
+
# Maximum available cache line size in arm64 implementations.
# Setting to maximum available cache line size in generic config
# to address minimum DMA alignment across all arm64 implementations.
--
2.7.4